Heat exchanger

Abstract

The present invention relates to a heat exchanger including a header including a tube joining part having a tube insertion hole into which a tube is inserted, in which the tube joining part is formed in a concave-convex shape to increase a contact area (joint area) between the heat exchange medium tube and the tube joining part, thereby reducing thermal stress to be applied to the tube and the tube joining part.

1 . A heat exchanger comprising:
 a header comprising base portions, a plurality of tube contact portions having tube insertion holes formed through the base portions, the plurality of tube contact portions protruding toward a tank from peripheries of the tube insertion holes and arranged to be spaced apart from one another in a longitudinal direction, and concave portions provided in at least some of the plurality of tube contact portions, formed at two opposite ends based on a width direction, and formed concavely in a direction opposite to a direction in which the tube contact portions protrude;   the tank coupled to the header and configured to define a space in which a heat exchange medium is stored and flows; and   a plurality of heat exchange medium tubes inserted into the tube insertion hole of the header and coupled to the tube contact portions.   
     
     
         2 . The heat exchanger of  claim 1 , wherein grooves are formed between the adjacent tube contact portions, and recessed portions, which are concave in the same direction as the concave portions, are positioned in at least some of the grooves. 
     
     
         3 . The heat exchanger of  claim 2 , wherein the recessed portion further protrudes in a direction opposite to the tank than the remaining portion of the groove other than the recessed portion. 
     
     
         4 . The heat exchanger of  claim 2 , wherein a width of the recessed portion and a width of the concave portion are defined at the same level. 
     
     
         5 . The heat exchanger of  claim 2 , wherein a recessed depth of the recessed portion and a recessed depth of the concave portion are defined at the same level. 
     
     
         6 . The heat exchanger of  claim 2 , wherein the recessed portion and the concave portion are formed simultaneously. 
     
     
         7 . The heat exchanger of  claim 1 , wherein straight portions, which have flat upper surfaces, are formed at two opposite ends of the tube contact portion based on the width direction, and the concave portion is disposed between the straight portions formed at the two opposite ends. 
     
     
         8 . The heat exchanger of  claim 7 , wherein a protruding height of the straight portion is larger than a protruding height of the concave portion. 
     
     
         9 . The heat exchanger of  claim 7 , wherein the concave portion and the straight portions at the two opposite ends of the tube contact portion based on the width direction are inclinedly connected. 
     
     
         10 . The heat exchanger of  claim 1 , wherein no straight portion, which has a flat upper surface, is provided at two opposite ends of the tube contact portion based on the width direction, and the two opposite ends of the tube contact portion based on the width direction and the concave portion are inclinedly connected. 
     
     
         11 . The heat exchanger of  claim 1 , wherein the base portions are present outside the tube contact portions positioned at the two opposite ends based on the longitudinal direction without a groove and a concave portion. 
     
     
         12 . The heat exchanger of  claim 1 , wherein the header further comprises dummy tube contact portions having dummy tube insertion holes formed through the base portions, the dummy tube contact portions protruding toward the tank from peripheries of the dummy tube insertion holes, and
 wherein the dummy tube contact portion and two opposite sides based on the longitudinal direction adjacent to the dummy tube contact portion are formed to be inclined downward from a central portion both the width direction toward two opposite ends.   
     
     
         13 . The heat exchanger of  claim 12 , wherein the two opposite ends of the dummy tube contact portion based on the width direction have a smaller protruding height than the central portion. 
     
     
         14 . The heat exchanger of  claim 12 , wherein the plurality of tube contact portions are each disposed at the two opposite sides of each of the base portions based on the longitudinal direction, and the dummy tube contact portion is disposed between the two opposite sides based on the longitudinal direction. 
     
     
         15 . The heat exchanger of  claim 12 , wherein the header has gasket seating grooves formed concavely downward along peripheries of the base portions,
 wherein tank coupling portions are formed along outer rims of the gasket seating grooves,   wherein the heat exchanger further comprises a gasket having peripheral portions inserted into the gasket seating grooves of the header, the gasket comprising a pair of bridges configured to connect the peripheral portions in the width direction and disposed adjacent to the dummy tube contact portion of the header,   wherein a lower end of the tank is inserted into the gasket seating groove of the header and coupled to the tank coupling portion of the header, and   wherein a pair of baffles is integrally formed in the tank, and the baffles are tightly attached and coupled to the bridges.   
     
     
         16 . The heat exchanger of  claim 15 , further comprising:
 dummy tubes inserted into the dummy tube insertion holes of the header and coupled to the dummy tube contact portions; and   heat radiating fins interposed between the plurality of heat exchange medium tubes.